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Classifications

D—TEXTILES; PAPER

D21—PAPER-MAKING; PRODUCTION OF CELLULOSE

D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR

D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties

C01F7/002—Compounds containing, besides aluminium, two or more other elements, with the exception of oxygen and hydrogen

C—CHEMISTRY; METALLURGY

C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

C02F1/00—Treatment of water, waste water, or sewage

C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities

C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents

C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron

D—TEXTILES; PAPER

D21—PAPER-MAKING; PRODUCTION OF CELLULOSE

D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR

D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution

D21H17/63—Inorganic compounds

D21H17/66—Salts, e.g. alums

Abstract

The subject of the present invention is aluminium polychlorosulphates having improved properties, their process of preparation and application of these aluminium polychlorosulphates to the treatment of drinking water, of aqueous effluents and in the papermaking industry. The aluminium polychlorosulphate has the formula: Al(OH)aClb(SO4)cMdNe in which: M represents an alkaline-earth metal; N represents an alkali metal; a, b, c, d and e are numbers such that: 1.95<a<2.4, 0<c<0.15, 0<d<0.16, 0<e<1.7, a + b + 2c = 3 + 2d + e.

Selon un mode de réalisation préféré, le polychlorosulfate d'aluminium selon la présente invention a pour formule: According to a preferred embodiment, the polyaluminumchlorosulfate of the present invention has the formula:

La basicité des produits selon la présente invention est très élevée; The basicity of the products according to the present invention is very high;selon un mode de réalisation, elle est supérieure à 67%, de préférence supérieure à 72%. according to one embodiment, it is greater than 67%, preferably greater than 72%.

L'élimination de la turbidité (NTU résiduel) est représentatif de la qualité de la floculation. The elimination of the turbidity (residual NTU) is representative of the quality of flocculation.ce test est mis en oeuvre avec l'eau de la Seine à pH 8,50 à 8,69, à 21°C. this test is carried out with water of the Seine at pH 8.50 to 8.69 at 21 ° C.Les résultats sont donnés comme le pourcentage d'amélioration par rapport au témoin (*). The results are given as the percent improvement compared to the control (*).